10/100/1000 Ports; Connecting To 10Base-T And 100Base-Tx Devices; Connecting To 1000Base-T Devices - Cisco WS-C2940-8TT-S Hardware Installation Manual

Appendix B Connectors and Cables

10/100/1000 Ports

The 10/100/1000 Ethernet port on the Catalyst 2940-8TT-S switch uses a standard RJ-45 connector.
Figure B-3
Figure B-3

Connecting to 10BASE-T and 100BASE-TX Devices

When connecting the ports to 10BASE-T and 100BASE-TX devices, such as servers, workstations, and
routers, you can use a two or four twisted-pair, straight-through cable wired for 10BASE-T
and100BASE-TX.
shows the four twisted-pair, straight-through cable schematics.
When connecting the ports to 10BASE-T- and 100BASE-TX devices, such as switches or repeaters, you
can use a two or four twisted-pair, crossover cable.
cable schematics.
You can use Category 3, 4, or 5 cabling when connecting to 10BASE-T devices. You must use Category
5 cabling when connecting to 100BASE-TX devices.

Connecting to 1000BASE-T Devices

When connecting the ports to 1000BASE-T devices, such as servers, workstations, and routers, you must
use a four twisted-pair, Category 5, straight-through cable wired for 10BASE-T, 100BASE-TX, and
1000BASE-T.
When connecting the ports to other devices, such as switches or repeaters, you must use a four
twisted-pair, Category 5, crossover cable.
Note Be sure to use a four twisted-pair, Category 5 cable when connecting to a 1000BASE-T device.
Use a straight-through cable to connect two ports only when one port is designated with an X. Use a
Note
crossover cable to connect two ports when both ports are designated with an X or when both ports do
not have an X.
OL-6157-01
shows the pinout.
RJ-45 Pinouts for 10/100/1000 Port
Pin Label
1 TP0+
2 TP0-
3 TP1+
4 TP2+
5 TP2-
6 TP1-
7 TP3+
8 TP3-
Figure B-6 shows the two twisted-pair, straight-through cable schematics.
Figure B-9 shows the four twisted-pair, crossover cable schematics.
Figure B-10 shows the straight-through cable schematics.
1 2 3 4 5 6 7 8
Figure B-7 shows the two twisted-pair, crossover
Figure B-11 shows the crossover cable schematics.
Catalyst 2940 Switch Hardware Installation Guide
Connector Specifications
Figure B-8
B-3